[Turk]

Backfiring during decelaration!!

My 427 Side oiler
Low Riser 2X4 Manifold
Low riser heads
(2) 4160 570cfm Holleys
9.6:1 compression
MSD 6AL box

is in need of further attention.

Carbs came back from Holley totally rebuilt, I don't even know what jets are in it. They restored them to original, and I am asssuming they installed whatever belonged on them. It was a complete restoration by their Custom Shop.

The car seems to run fine, except during decelaration there is serious "pop, pop". they are almost like mini backfires. Sounds cool, yet I have been told by others who are more knowledgable than I that looking at the exhaust and the color of the pipes, my carbs are running too rich. Pulling 6 or so of the spark plugs shows that they are not to far off the desired color.

I am going to have someone rejet, the carbs, but not having had this done before, I am curious to see if anyone else is running a similar setup, and what would be good numbers for jets for starters.

Front carb, and rear carb...would they requier different jets?
I appreciate any help on this subject you could provide. If what i posted regarding the engine is not sufficient let me know what other pieces of the puzzle you require.

Thanks,

TURK